如何在ngClass中使用动态值 [英] How to use a dynamic value with ngClass

问题描述

我正在尝试应用与范围变量相同的类名.

I'm trying to apply a class name that's the same as a scope variable.

例如:

<div ng-class="{item.name : item.name}">

以便将item.name的值添加到类中.不过，这似乎没有任何作用.有关如何执行此操作的任何建议?

So that the value of item.name is added to the class. This doesn't seem to do anything though. Any suggestions on how to do this?

谢谢！

这实际上是在选择中使用ng-options完成的.例如:

This is actually being done within a select, using ng-options. For example:

<select ng-options="c.code as c.name for c in countries"></select>

现在，我想应用一个值为c.code

Now, I want to apply a class name that has the value of c.code

我找到了以下指令，该指令似乎可行，但不能对该值进行插值:

I found the following directive, which seems to work, but not with interpolation of the value:

angular.module('directives.app').directive('optionsClass', ['$parse', function ($parse) {
  'use strict';

  return {
    require: 'select',
    link: function(scope, elem, attrs, ngSelect) {
      // get the source for the items array that populates the select.
      var optionsSourceStr = attrs.ngOptions.split(' ').pop(),
      // use $parse to get a function from the options-class attribute
      // that you can use to evaluate later.
          getOptionsClass = $parse(attrs.optionsClass);

      scope.$watch(optionsSourceStr, function(items) {
        // when the options source changes loop through its items.
        angular.forEach(items, function(item, index) {
          // evaluate against the item to get a mapping object for
          // for your classes.
          var classes = getOptionsClass(item),
          // also get the option you're going to need. This can be found
          // by looking for the option with the appropriate index in the
          // value attribute.
              option = elem.find('option[value=' + index + ']');

          // now loop through the key/value pairs in the mapping object
          // and apply the classes that evaluated to be truthy.
          angular.forEach(classes, function(add, className) {
            if(add) {
              angular.element(option).addClass(className);
            }
          });
        });
      });
    }
  };

}]);

推荐答案

我使用的是角度1.5.5，但这些解决方案都不适合我.

I'm on angular 1.5.5 and none of these solutions worked for me.

尽管仅在 the最后一个例子在这里

<div ng-class="[item.name, {'other-name' : item.condition}]">

这篇关于如何在ngClass中使用动态值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！